When driving in very heavy rain, can front and rear fog lights be used?

Correct answer

Yes, and it is also compulsory to use the rear fog light.

When driving in very heavy rain, it is permitted, and indeed advisable, to use front and rear fog lights. In Spain, the use of these lights is regulated to improve visibility in adverse weather conditions. Here is a brief explanation of how to use each light: Rear Fog Lights: These are compulsory in conditions of very heavy rain, thick fog, heavy snowfall, or dense clouds of dust or smoke. Front Fog Lights: Although not compulsory like the rear ones, their use is advisable in these conditions as they improve visibility of the road ahead of the vehicle. Conditions for Use: The rear fog light can only be switched on when the dipped beam, main beam, or front fog lights are also switched on.